Lamp arm



FIG. 1 is a perspective view of a “lamp arm” showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view showing the practical usage thereof.

The broken line environmental showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a “lamp arm”, as shown and described. 